Cutter-guiding templet for routing-machines.



G. W. MONTGOMERY. GUTTER GUIDING TBMPLET FOR ROUTING MACHINES.

APPLICATION FILED 00T. 26,.1908.

Patented Jan. 12, 1909.

EEES" J-GHARLES w.MoNreoMEar,ger,l RICHMOND, VIRGINIA.

gLggoUT'rER-GUIDING TEMPLET ron nomme-MACHINES.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application led October 26, 1908. Serial No. 459,620.

To all whom it may concern:

Be it known that I, CHARLES W. MONT- GOMERY, a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Improvements in Cutter- Guiding Templets for Routing-Machines; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the art of woodworking, but has reference more particularly to routing machines, and with still greater particularity to those known as Stringer routing machines.

It has for its object the production of a cutter-guiding attachment or adjustable templet for machines of the class stated, which is designed, arranged and adapted primarily for directing with accuracy and precision the operation of routing or gaining out the customary housings for stair-treads and risers in wall stringers or carriages.

It has for a further object a pitch-regulating pivotal support for a cutterguiding templet, and means whereby a cutting tool may be directed to and beyond the pivotal center of said support.

For a further object the present invention contemplates certain characteristic and novel features of construction whereby the templet is rendered pivotally movable upon a center that always coincides with, or is in vertical alinement with, the point of intersection of the proposed tread and riser-grooves; and whereby the templet may be instantly adjusted and set to vary the pitch and meet all requirements as to height and run of different stairways.

As a further object the present invention provides novel and practical means for. cutting the housings, including the nose cuts, in either right or left hand carriages, without the necessity of inverting the templet, or altering the aforesaid relation of its pivotal center and point of intersection of the proposed tread and riser grooves. The ob'ects of this invention being primarily as aforesaid, its preferred form of construction will be hereinafter particularly described, and set forth in the claims followino.

Tn the accompanying drawings, which form part of this application, and whereon like numerals indicate corresponding parts in the several views: Figure 1 is a plan view of my improved templet and coperating parts, attached to the bed of a routing machine, showing also a fragmentary portion of a left-hand stair carriage partly cut. Fig. 2 is a vertical central section of parts shown by Fig. 1, being taken on the line xof said ligure. Fig. 3 is a fragmentary view in perspective showing a pivotal switchblock for controlling the nose cut in housings. Fig. 4 is also a fragmentary view, showing in side elevation a portion of one right-hand stair carriage, while in section is shown one full riser and one full stair-tread as provided for by the invention.

Reference being had to the drawings and numerals thereon, 1 indicates the table of a routing machine, 2 a gage strip or fence, and 3 a stair stringer or carriage, the purposes whereof are all well understood. 'Secured to said table 1 by through-bolts 4 passing also through the interposed fence 2, is a supporting frame or body member 5 its front edge indented by a sectoral recess or socket 6 undercut as at 7 and slightly exceeding a semi-circle in its circumferential dimensions. Within the said recess or socket 6 is fitted a sector-shaped boss or member 8, rising from the surface of the cutter-guiding templet 9, and having a circumferential flange 1() snugly housed by the aforesaid undercut 7, as best shown by Fig. 2. This member 8 may-be cast integral or otherwise affixed to the templet, but in any event coperates with its mating socket 6 to form a sectoral support for the templet which is thus accorded an oscillatory movement upon the pivotal center of said support. And, owing to the embracing form of the socket 6 at its outer ends, the said member 8 is retained against horizontal displacement. lt is also retained against vertical separation by agency of its circumferential flange 10 before mentioned, and may be still further safeguarded in this particular by a superposed surface flange 11 of circular form and secured as shown by Figs. 1 and 2.

Projecting rearwardly from its pivotal support the templet proper, represented in the present illustrations as of substantially triangular shape, is broken by cutter-guiding slots 12 and 13. These slots are each provided with face or front guiding edges 14, 15, respectively, arranged at right angles and intersecting at 16 the pivotal center of oscillation. l/Vhile Vextending slightly beyond the saidV point of intersection are corresponding nose-guides 17, and 18 forming extensions of the slots 12 and 13 respectively. Opposite the guiding edges 14 and 15, slots 12 and 13 are bounded by rear cutter-guiding edges 19 and 20 which latter however, diverge slightly for purposes that will later appear.

Pivotally mounted upon the templet 9 at a point directly in front of its oscillatory center is a switch-block 21 having a locking tongue 22, countersunk seats 23-23, and adapted, as indicated by Fig. 3, to bridge one or the other of the nose-guides 17 or 18 according to circumstances. Y

Near its opposite or inner side the templet 9 is broken by a curved slot 24 through which extends a locking screw 25 projected from the machine bed or table 1, as best shown by Fig. 2, and fitted with a binding nut or screw wheel 26 for securely holding the templet in its adjusted positions.

This being a description of my invention in its preferred form of construction it will be noted that the various parts may be formed of any suitable material or materials, preference, however, being given to metal owing to its durability and other characteristic advantages; and, while the foregoing exemplifies the invention in the best form at present known, it should be understood that various changes and modiications may be'made without departing from the spirit of the invention, the o eration whereof is substantially as fol ows, when used in conjunction with a stringrouting machine. A wall-Stringer or carriage such as 8 (Figs.V 1 and 4) having first been laid ofi' as indicated in dotted lines according to the required pitch, same is placed beneath the templet 9 against fence 2 as a front guide. The single hand wheel 26 is next loosened, the templet revolved upon its pivotal center 16 until its treadguide 14 and riser-guide 15 register with the stair plan as indicated by dotted lines,

whereupon the wheel 26 is again set downV to securely retain the templet at the ven angle. This accomplished, string 3 1s secured to bed V1 by suitable clamps (not shown) as usual, and the invention is ready for use. The usual collar upon the cutterspindle or chuck of a routing machine, directed by the thread guiding edge 14 of slot 12 is now utilizedto conduct the cutting tool over the switch-block 21 to the pivotal center of the templet and beyond to form the nose cut 17. Likewise, oppositely arranged guiding edge 19 limits andk directs the action of the routing tool in that direction, but here, as usual in stair building, it will be noted the cut is diverging to provide for the wedges 27 ordinarily emshowing in dotted lines a routing tool 30 in process of making said riser out. This accomplished, carriage 3 is advanced beneath templet 9 and the process repeated. Thus it will be observed that the pitch of stair-strings may be instantly changed to provide for stairs of varying height and run, by a mere release and rotation of templet 9 upon its pivotal center; and when it is desired to change from a right hand to a left hand string this also is as readil accomplished by a mere reversal in the position of the pivotal switch-block 21, whereupon without the necessity of inverting it the templet is instantly converted from a left to a right-string templet, or vice versa.

Having thus -described my invention, what I claim and desire to secure by Letters Patent is: Y

1. In a cutter-guiding templet for routing machines, the combination with a pivotal support for said templet, of means for directing a cutting tool to the pivotal center of said support, substantially as described.

2. In a cutter-guiding templet for routing machines, the combination with a pivotal support for said templet, of means for directing a cutting center of said support, substantially as described.

3. Ina cutter-guiding templet for routi machines, the combination with a sectora support for said templet, of means for directing a cutting tool to the pivotal center of said support, substantially as described.

4. In a cutter-guiding templet for routin machines, the combination with a sectora support for said templet, of means for directing a cutting tool to the pivotal center of said support, and means for preventin horizontal separation of said templet and support, substantially as described.

5. In a cutter-guiding templet for routin machines, the combination with a sectoral support for said templet, of means for directing a cutting tool to the pivotal center of said support, and means for preventing a vertical separation of said templet and support, substantially as described.

6. In a cutter-guiding templet for routing machines, the combination with a sectoral member carried by said templet, of a supporting socket mating with said member, and means for directing a cutting tool to the pivotal center of said support, substantially as described.

7. In a cutter-guiding templet for routin machines, the combination with a sectora support for said templet, of means for ditool to and beyond the pivotal Y recting a cutting tool to the pivotal centerof said support, and means for securing the templet in position for use at a predetermined angle, substantially as described.

8. In a cutter-guiding templet for stringrouting` machines, the combination With tread and riser guides, of a nose guide at the intersecting ends of both guides aforesaid, and means for closing either of said nose guides, substantially as described.

9. In a cutter-guiding templet for stringrouting machines, the combination with tread and riser guides, of a nose guide at the intersecting ends of the guides aforesaid, and a switch-block adapted to bridge either of said nose guides, substantially as described.

10. In a cutter-guiding templet for stringrouting machines, the combination With tread and riser guides, of nose guides at the end of both guides aforesaid, a switch-block adapted to bridge either of said nose guides, and means for retaining said block in its predetermined position, substantially as described.

1l. In a cutter-guiding templet for stringrouting machines, the combination with tread and riser guides, of nose guides at the end of both guides aforesaid, a switch-block flush With the surface of said templet and pivotally secured thereto for bridging either of said nose guides, and means for retaining said block in its predetermined position, substantially as described.

l2. In a cutterguiding attachment for string-routing machines, the combination With a fence undercut upon its guiding edge, an adjustable templet provided With tread and riser guides, a sectoral support for said templet having a pivotal center coincident with the point of intersection of said tread and riser guides, a nose cut communicating with both guides aforesaid, and a switchblock adapted to bridge either of said nose cuts, substantially as `described.

In testimony whereof I aiiix my signature, in presence of two subscribing Witnesses.

CHARLES W. MONTGOMERY. Witnesses CHARLES F. DUGGARD, MITFORD SIMS. 

